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Before contest
Codeforces Round 978 (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
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Status
Standings
Custom test
Problems
#
Name
1468N
Waste Sorting
greedy
,
implementation
900
x8171
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x948
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x323
1468K
The Robot
brute force
,
implementation
1600
x5101
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x4294
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x500
1468H
K and Medians
constructive algorithms
,
greedy
,
math
2200
x1797
1468G
Hobbits
binary search
,
geometry
2500
x817
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3721
1468E
Four Segments
greedy
800
x8793
1468D
Firecrackers
binary search
,
sortings
1700
x4670
1468C
Berpizza
data structures
,
implementation
1400
x7836
1468B
Bakery
data structures
,
dsu
2900
x214
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1666
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1437
1467D
Sum of Paths
combinatorics
,
dp
,
math
2200
x3690
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6394
1467B
Hills And Valleys
brute force
,
implementation
1700
x10961
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x24324
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x197
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x272
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x921
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2868
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x7308
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x11351
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17649
1466B
Last minute enhancements
dp
,
greedy
800
x22660
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x22543
1464F
My Beautiful Madness
data structures
,
trees
3500
x325
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x588
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1517
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4430
1463C
Busy Robot
implementation
1800
x5660
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x19400
1463A
Dungeon
binary search
,
math
1100
x25570
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x6973
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9717
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13747
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16746
1462C
Unique Number
brute force
,
greedy
,
math
900
x32551
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x27131
1462A
Favorite Sequence
implementation
,
two pointers
800
x41673
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x553
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2117
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x9247
1461C
Random Events
dp
,
math
,
probabilities
1500
x11229
1461B
Find the Spruce
brute force
,
dp
,
implementation
1400
x12634
1461A
String Generation
constructive algorithms
,
greedy
800
x18578
1459B
Move and Turn
dp
,
math
1300
x14822
1459A
Red-Blue Shuffle
math
,
probabilities
800
x17000
1458F
Range Diameter Sum
data structures
,
trees
3500
x280
1458E
Nim Shortcuts
data structures
,
games
3100
x493
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x1098
1458C
Latin Square
math
,
matrices
2700
x1315
1458B
Glass Half Spilled
dp
2000
x3551
1458A
Row GCD
math
,
number theory
1600
x17818
1456E
XOR-ranges
dp
,
greedy
3500
x279
1455G
Forbidden Value
data structures
,
dp
2900
x411
1455F
String and Operations
dp
,
greedy
2800
x443
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1533
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12324
1455C
Ping-pong
constructive algorithms
,
games
,
math
1100
x19595
1455B
Jumps
constructive algorithms
,
math
1200
x21841
1455A
Strange Functions
math
,
number theory
800
x26431
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x4044
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5811
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x20448
1454C
Sequence Transformation
greedy
,
implementation
1200
x21447
1454B
Unique Bid Auction
implementation
800
x28312
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x40546
1453F
Even Harder
dp
2700
x838
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2042
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4162
1453C
Triangles
greedy
,
implementation
1700
x6035
1453B
Suffix Operations
constructive algorithms
,
implementation
1400
x13341
1453A
Cancel the Trains
implementation
800
x22626
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x487
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x317
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1561
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7985
1452C
Two Brackets
greedy
800
x19562
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14728
1452A
Robot Program
math
800
x22109
1451F
Nullify The Matrix
constructive algorithms
,
games
2700
x983
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2971
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4379
1451D
Circle Game
games
,
geometry
,
math
1700
x9521
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15574
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19260
1451A
Subtract or Divide
greedy
,
math
800
x24206
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x219
1450H1
Multithreading (Easy Version)
combinatorics
,
fft
,
math
2900
x436
1450G
Communism
bitmasks
,
dp
,
trees
3500
x312
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1347
1450E
Capitalism
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2700
x1121
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5489
1450C2
Errich-Tac-Toe (Hard Version)
constructive algorithms
,
math
2300
x3702
1450C1
Errich-Tac-Toe (Easy Version)
constructive algorithms
,
math
2100
x5504
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x15188
1450A
Avoid Trygub
constructive algorithms
,
sortings
800
x17983
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